Multiple Choice
Which of the following best describes the relationship between the mole and concentration in a solution?
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2. Atoms & Elements
Mole Concept
Multiple Choice
One mole of which of these compounds contains two moles of hydrogen atoms?
A
CH4
B
NH3
C
H2O
D
C2H6
Verified step by step guidance1
Identify the number of hydrogen atoms in one molecule of each compound: For CH4, there are 4 hydrogen atoms; for NH3, there are 3 hydrogen atoms; for H2O, there are 2 hydrogen atoms; and for C2H6, there are 6 hydrogen atoms.
Recall that one mole of any substance contains Avogadro's number of molecules (approximately \(6.022 \times 10^{23}\) molecules).
Calculate the total number of moles of hydrogen atoms in one mole of each compound by multiplying the number of hydrogen atoms per molecule by one mole: For example, for H2O, 1 mole of molecules \(\times\) 2 hydrogen atoms per molecule = 2 moles of hydrogen atoms.
Compare the results for each compound to determine which one contains exactly 2 moles of hydrogen atoms per mole of compound.
Conclude that the compound with 2 hydrogen atoms per molecule will have 2 moles of hydrogen atoms in one mole of the compound, which matches the correct answer.
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